private void tlbtnSumDetailed_Click(object sender, EventArgs e)
{
DataSet ds = null;
billinfo.Handle = tltxtHandle.Text;
billinfo.Units = tltxtUnits.Text;
ds = baseinfo.BuyStockSumDetailed(billinfo, "tb_StockSumDetailed", dtpStar.Value, dtpEnd.Value);
dgvStockList.DataSource = ds.Tables[0].DefaultView;
}